气候变化领域集成服务门户(CCPortal): Lake water isotope variation linked with the in-lake water cycle of the alpine Bangong Co, arid western Tibetan Plateau

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DOI	10.1657/AAAR0015-028
	Lake water isotope variation linked with the in-lake water cycle of the alpine Bangong Co, arid western Tibetan Plateau
	Wen, Rong; Tian, Lide; Liu, Fengjing; Qu, Dongmei
通讯作者	Wen, R (通讯作者)
发表日期	2016
ISSN	1523-0430
EISSN	1938-4246
起始页码	563
结束页码	580
卷号	48 期号:3
英文摘要	Water isotopes play an important role in the study of the alpine lake water budget and the hydrological cycle in the arid, far western Tibetan Plateau. These isotope records, derived from well-preserved sediments, are believed to reflect climatic and environmental changes. Using two years of delta O-18 and delta D data from precipitation, river water, underground water, and lake water at the long alpine lake Bangong (LBG), together with local meteorological observations in the arid western Tibetan Plateau, this study reveals that the delta O-18 in the lake is over 10 parts per thousand more enriched than that in the local precipitation due to evaporation of the lake water. Spatial changes in both the lake water delta O-18 and d-excess (= delta D - 8 * delta O-18) are apparent, ranging from similar to-4.9 parts per thousand to +0.9 parts per thousand for delta O-18, and -13.22%o to -30.85%0 for d-excess, respectively, from east to west of the lakes. Simulation with the Craig-Gordon model shows that the isotopes in alpine inland lake water are controlled to a great extent by local relative humidity. Using a modified partly mixed isotope fractionation model, we rebuilt the spatial change of the evaporation/inflow (E/I) ratios from east to west of the lake. A quantitative estimation shows that the E/I ratio of the lake water increases from 0.73 similar to 0.83 in the eastern part and 0.90 similar to 0.93 in the western part of LBG. We also found that by assuming a full development of kinetic fractionation of the environmental vapor isotopes, our simulation result matched the observed spatial change for both delta O-18 and d-excess, confirming the strong inland evaporation enrichment in the northern part of the plateau. This research may increase our understanding of inland water movement in the alpine Tibetan lakes, and also will improve our understanding of the lake sediment isotope record.
关键词	STABLE ISOTOPES NAM-CO ENVIRONMENTAL-CHANGES LACUSTRINE CORE CLIMATE-CHANGE MASS-BALANCE BASIN LEVEL PRECIPITATION OXYGEN
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography
WOS类目	Environmental Sciences ; Geography, Physical
WOS记录号	WOS:000382800700009
来源期刊	ARCTIC ANTARCTIC AND ALPINE RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258765
推荐引用方式 GB/T 7714	Wen, Rong,Tian, Lide,Liu, Fengjing,et al. Lake water isotope variation linked with the in-lake water cycle of the alpine Bangong Co, arid western Tibetan Plateau[J]. 中国科学院青藏高原研究所,2016,48(3).
APA	Wen, Rong,Tian, Lide,Liu, Fengjing,&Qu, Dongmei.(2016).Lake water isotope variation linked with the in-lake water cycle of the alpine Bangong Co, arid western Tibetan Plateau.ARCTIC ANTARCTIC AND ALPINE RESEARCH,48(3).
MLA	Wen, Rong,et al."Lake water isotope variation linked with the in-lake water cycle of the alpine Bangong Co, arid western Tibetan Plateau".ARCTIC ANTARCTIC AND ALPINE RESEARCH 48.3(2016).